thoft - I’ll pick up this SCS4t query. It is a regular SCS4 on a built-in stand which is acoustically non-functional. The stand provides no bass boost or any other function than to elevate the speaker. I have an SCS4 here - the final iteration of the 02-SCS series. It uses the coax PowerDriver that inhabits all the 6.5" HT models. It is a well developed driver with all the Thiel special sauces. The twin ports seem to be some sort of tractrix or similar advanced room coupling form, but they present a rather convoluted baffle plane for the waveform launch. Perhaps the unbraced cabinet might have some resonances. All that said, I don’t warm up to the SCS4; it presents a somewhat hollow and edgy sound compared to many other Thiel speakers. In my experience (far from all Thiel speakers) I would place it as the weakest entry for dedicated music listening; but it's probably a pretty good Home Theater contender.
As an aside, I use one (or two) SCS4s on stands for live sound reinforcement in a small venue where it shreds the regular contenders. Try to get an audition against some known speaker of your choice.